#include <stdlib.h>
#include <string.h>

char* stringFromChar(char car) {
    char* str = calloc(2, sizeof (char));
    str[0] = car;
    str[1] = '\0';
    return str;
}

char* concat(char* str1, char* str2) {
    int len = strlen(str1) + strlen(str2);
    char* newstr = calloc(len + 1, sizeof (char));
    strcpy(newstr, str1);
    return strcat(newstr, str2);
}